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Theoretical formula of Li-ion battery tabs design
Theoretical parameters of battery tabs material
(1) The safe current-carrying value of nickel tabs is 11-13A/mm2, the conductivity of nickel is at 140,000 S/cm, and the melting point is 1200℃～1400℃.
|
Tabs thickness/mm |
Tabs width/mm |
Overcurrent capacity/A |
| 0.1 | 3 | 3.5 |
| 0.1 | 4 | 4.5 |
| 0.1 | 5 | 5.5 |
| 0.1 | 6 | 6.5 |
(3) The safe current-carrying value of aluminum tabs is 3-5A/mm2, the conductivity of aluminum is 369000 S/cm, and the melting point is about 660℃.
The design of the lithium battery tabs has a significant impact on the overcurrent capability. Generally, the cathode and anode electrodes of Li-ion batteries are connected through tabs inside the battery. Nickel tabs (nickel-plated copper) or aluminum tabs are connected to the anode and cathode caps, respectively.
Conventional lithium-ion batteries use aluminum tabs for the cathode tabs and nickel tabss for the anode tabs, but nickel tabs have poor electrical conductivity. During high-magnification discharge, the low conductivity of anode tabs leads to high surface temperature of the battery, which affects the high-magnification discharge performance of the battery, but the nickel-plated copper anode tabs have excellent electrical conductivity, and their electrical conductivity is close to that of pure copper.
In addition, the influence of the battery tabs material, size and tabs lead-out method on the multiplier discharge performance and multiplier cycle performance of lithium-ion batteries.Generally speaking, the current on the wire is proportional to the cross-section of the wire, that is, the larger the cross-section area of the wire, the greater the current allowed to pass through. The choice of battery tabs size is determined not only by the type of battery, but also by the maximum discharge current of the battery.
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